We have both DB2 and CICS, I believe the subsystems themselves can handle the time change forward or back the real question is if your applications can. I know I have a CICS application that uses local timestamps in some of their files (some as part of the key) so we will shutdown our CICS and DB2 subsystems when the clock is set backwards (Fall time change).
I've never used the SET TIMEZONE command I assume that it changes the local time when issued? That would be much easier than trying to issue a SET CLOCK at the precise second. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of McKown, John Sent: Friday, February 18, 2011 8:27 AM To: IBM-MAIN@bama.ua.edu Subject: Re: [IBM-MAIN] Change the Summertime ZOS under Z/VM To change the local clock, which really just adjusts the offset from the hardware clock, use the T CLOCK=hh.mm.ss command. If you want to change like from standard time to daylight savings time, it's even easier (example is US Central) T TIMEZONE=W.06 for standard time or T TIMEZONE=W.05 for daylight savings time. This assumes the hardware clock is set to UTC (GMT). There is __NO__ command to change the actual hardware clock in z/OS. Some have said that if you set the clock backwards, you need to IPL. I will say that we do not do this! We don't have DB2. We do have CICS. For each CICS region, after changing the clock in z/OS, enter the CICS transaction: CEMT PER,RESET If you have the z/OS consoles defined to your CICS region, you can do this with a MODIFY command: F cicsreg,CEMT PER,RESET This is how we do it. In fact, it is done by running a batch job which issues the commands. This job is a normal part of our schedule and so is done automatically for us. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Sergio Lima > Sent: Friday, February 18, 2011 6:42 AM > To: IBM-MAIN@bama.ua.edu > Subject: Change the Summertime ZOS under Z/VM > > Hello List, > > Next week end will finish the summertime here in Brazil. > We have ZOS running under Z/VM. > Under Z/vm, We know how change the clock, but not in ZOS. > We need give a IPL ? > > Thanks, > > Sergio Lima Costa. > Sao Paulo - Brazil > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
